Grease gun



March 18, 1930. R, GRAY 1,751,323

GREASE GUN Filed May 21, 1927 2 Sheets-Sheet l le] 26 3 (g Z ze 20- v f7G G2 K f 1 l' o a u 82 GO 5G E 8O la '74- l BS O 1s o 7 74 A l |Z 3Q 1Ff 2 6c $6 48 g Inve/ for. 2o 2S 7?. J.' Cir-ay.

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R. J. GRAY GREASE GUN March 18, 1930.

Filed may 21, 1927` 2 sheets-sheet 2 Invenor': 7.?. J' Gray. By #MQW/fPatented Mar. 18, 1930 l UNITEDsTAT-Es PATENT oFFlclezj RUSSELL J. GRAY,OE MINNEAPOLIS, MINNESOTA, ASSIGNOR To GRAY COMPANY, I No., s

` or MINNEAPOLIS, MINNESOTA Application led May 21, 1927. Serial VNo.193,359.

, My invention relates to grease guns, and anobject isto provide adevice of this character which is simple in construction and eflicientin operation. It vhas been customary heretofore to provide grease gunsembodying lcylinders in which plungers operate in such mannerV thatvgrease is drawn in at one end of the cylinder and then upon reversemovement of the plunger is forced out at this same end of the cylinderthrough adelivery t-ube. An obj ect of my 'invention is to provide acombination which embodies a hollow member in communication at one endwith the interior of a grease receptacle7 a delivery tube incommunication Ywith the other end of the hollow member and a deviceadapted to be reciprocated in the hollow member for causing grease tomove therethrough from said first mentioned endV and be delivered at theother end into` the delivery tube. Another object is to provide a greasegun which may be conveniently operated to deliver either small or largeshots of grease as desired.

The full objects and advantages of my in vention willappear inconnectio'nwith the detailed description thereof, and the novel featuresof my inventive idea will be particularly pointed out in the claims.

In the accompanying drawings which illustrate one form in which myinvention may beembodiedr'- n Fig. 1 .is a top plan view of theapparatus. Fig. 2 is a side elevational View. Fig. 3 is a view invertical section.

Referring to the construction shown in .the drawings, the .numeral 10designates a 4grease receptacle whichl at its upper end is provided witha lli'ng'opening adapted to be closed by a cover 12. For convenient useof the device, a casting14 is secured to the bottom of the receptacle,this casting having two arms 16 and 18 extending out at Oneside andcarrying a shaft 2O upon which wheels 22 and 24 are mounted The otherside of the casting Vhas a downward extension 26 which terminates in avfootmember 28 whose l upper surface is corrugated in orderthat vthefoot of the Voperator vmay not slip off. Above the side having the footmember 28 a handle 30 is secured to the top ofthe receptacle; By liftingup on this handle, the foot whichthe upper threaded end of acylinderV i38 is screwed. The lower end of the cylinder 38 is threaded to receiveinternal threads on a valve casing 40 within whichisanupwardly Openingcheck valve 42. The lower end of the casing 40 is spaced somewhat abovethe bottom of the receptacle and has an opening which is controlled bythe valve'42. 1 A pin 44 extends across the casing 40 above the valve 42for limiting the upward movement c thereof. The wall of the receptacle10 is perforated inline with the laterally extending chamber 36 and theadjacent' portion of this chamber is screwthreaded to receive thethreads on a hollow stem 46 formed integrally with a valve casing 48which contains-an out` .wardly opening check valve-50 backed bya coiledspring 52 which engages the rear end of a coupling member 54 whichconnects the valve casing 48 with a socket member 56. A ball 58 locatedin this socket has a passageway therethrough which continues ball andadapted to receive a flexible tube 62 leading to the place where thegrease is to be on through 'a stem 60 projecting out from the.

applied. A washer 64 in the socketmember 56 engages the rear end of theball 58,y this member being backed up by a coiledspring` 66. The ball 58is thus held firmly in engagement withthe forward end of the socket soas to have a tight lit therewith to prevent leakage and at the same timethe ball can be turned in vaccordance with the inclination of the tube62. The simple and yet extremely eiicient'construction of my device willnowrbe apparent when itis observed that the cylinder 38 contains aplunger64 having a diameter somewhat less than the internal diameter' ofthe cylinder 38 so ,that-thereis a clearance or space indicated at 66between the plunger and the cylinder so that the grease Y Y is forcedupwardlypin the cylinder when the plungerv is depressed. The plungerpasses through the projection 34, thev latter being Aprovided with apacking gland 68 so that there is no leakage around theV plunger; rllheupper'end of the plunger has-a Collar 170 'se,

cured thereto. A coiled spring 72V interposed between the collar:'Ogand'the'.casting'82 normally holds the plunger elevated to theextent shown in Fig The collar() has two lugs 74 and 7 6 extending uptherefrom in spaced-relation to each otherV and carrying a 'pin .7 8which bridges'the gap between the Vthe pin 7 8 so thatY upon depressingthe lever lugs near their lower ends. A lever80` passes between the lugs74 and 76 and restsupon the plunger 64 will be forced further down intothe cylinder. Gne end of this'lever is provided with an operating handle82 and the other end is connected by a link 84 with a lug Y86 carried bythe `casting 32. The upperends of the lugs 74 and 7 6 carry handlemembers 82 and 9 The operation and advantages of myV inventionwill bereadily understood in connection .with the foregoing description. Theparticular construction shown operates upon the principle ofdisplacement since the more causes grease to move upwardly in theicylin-4 der 88 and to be displaced laterally lout through the deliverytube. l/Vhen the handle 82 is released, the spring 7 2 causes' theplunger 64 to be returned to theposition shown in Fig. 3, this movementof ythe plunger causing grease to be drawn intothe lower portion of thecylinder 88 since the check valve 42 is now free to move upwardly andthe check valve 50 Y has automatically closed V,and prevents backwardmovement of grease into the cylinder.

Y This operation can be'repeated as fast as the tube 62 is moved Itoengage successive places which are to be lubricated. The action oi. thespring Z 2 causes the plunger to be raised sufficiently for ordinarysmall charges 'of grease. Much larger charges or shots of grease can beobtained when the lever is thrown over out of the way. The plunger 64can then be lifted much further than it vis carried up by the spring 7 2such movement being effected by grasping the handles 88 and 90. A muchlarger lcharge of grease will besuckedinto the cylinder and'upon'depression the plunger, this large charge will be forced outthrough the delivery tube. y Y Y I claim: v Y

cylinder extendingfrom said chamber to a place near the bottom-of saidreceptacle,1an

upwardly opening check valve atthe bottom of said cylinder, a plunger ofsmallerL diamf eter than the interior dimension of said cyli`nderandworking therein, said plunger extending up through said chamberedmember, an enlargement on the upper end of said'plunger, a coiled springinterposed betweensaid enl. A' grease gun y,comprising a grease re-Vceptacle, a member containing a chamber Vsecured to the upper end ofsaid. receptacle, a Y, delivery tube connected with said chamber, a

largement and said chamberedy member, Va

handle ixedlysecured to *the* upper end of said plunger, and anoperating lever pivotalL ly connected with said receptacle for down-yward engagement only withV the upperend of said plunger.v Y

Y V2. A-grease gun comprising a grease receptacle, `a memberconstituting a chamber secured to the upper end of said receptacle, adelivery tube connected with said chamber, a cylinder extendingfrom'said chamber to a place near thebottom of the receptacle, lan 'up-Vwardly opening'check valve at the bottombf said cylinder,a plungerofsma'ller diameter.v

than the interior dimension Vof said cylinder and working therein, saidplunger extending' up through said chambered member,1an en` largement onthe upper end of said plunger, a coiled spring interposed betweensaid-enlargement and said vchambered member, lugs extending up from saidenlargement, apin.

bridging the gap between said lugs near their lower ends, anoperatinglever pivotally con- Y nected with said receptacle. Vfor 4downwardvengagement only with the upper side of said y pin, and handles iixedlysecured tothe upper ends'of said lugs. Y y

84A grease gun` comprising a grease receptacle, a member containing a.chamber secured to thel upper end of saidreceptacle, a

delivery tube extending out from said cha-m.

ber, a cylinder extending from said chamber to a place near the bottomof said receptacle,

an upwardly opening check valve at the lower end of said cylinder, aplunger of smaller diameter than the interior dimension of said cylinderworking therein,a 'spring` normally lio holding said plunger in partlylifted position l and permitting it to be fully lifted, an operatinglever pivotally connected with said re ceptacle for downward engagementonly With the upper end of said plunger, and a handle Xedly secured to'the upper end of said plunger by means of which the latter may be fullylifted and depressed.

In testimony whereof I hereunto aiiiX my lo signature.

RUSSELL J. GRAY.

